Extinction ratio testing system for optical transceiver module and extinction ratio testing method for optical transceiver module

ABSTRACT

An extinction ratio testing system ( 10 ) includes a microcontroller ( 102 ), an extinction ratio tester ( 104 ), and a thermostat ( 106 ). The microcontroller ( 102 ) controls the thermostat ( 106 ) to maintain an optical transceiver module ( 20 ) at a predetermined high temperature, and then the microcontroller ( 102 ) controls the extinction ratio tester ( 104 ) to test an extinction ratio of the optical transceiver module ( 20 ). If the extinction ratio is lower than a standard extinction ratio, the microcontroller ( 102 ) controls the optical transceiver module ( 20 ) to increase a laser operating current ( 212 ) of the optical transceiver module ( 20 ) to increase the extinction ratio.

BACKGROUND OF THE DISCLOSURE Technical Field

The present disclosure relates to an extinction ratio testing system andan extinction ratio testing method, and especially relates to anextinction ratio testing system for an optical transceiver module and anextinction ratio testing method for the optical transceiver module.

Description of Related Art

After the related art optical transceiver module is manufactured, therelated art optical transceiver module will be tested in accordance withthe testing standards. Only the related art optical transceiver modulewhich passes the testing standards can be guaranteed to have the goodperformance and thus can be provided to the customers to use.

Among the testing standards for the related art optical transceivermodule, the extinction ratio test is an important testing item. Theextinction ratio refers to the ratio of the average power of the laserpower at logic 1 to the average power of the laser power at logic 0.

The temperature is one of the factors that affect the extinction ratio.In the extinction ratio test for the related art optical transceivermodule, the related art optical transceiver module must be tested forthe extinction ratio at different temperatures (such as the normaltemperature and the high temperature) respectively.

Currently, the problem of the extinction ratio test of the related artoptical transceiver module is that the pass rate of the extinction ratiotest of the related art optical transceiver module is not high enough,which seriously affects the production capacity of the related artoptical transceiver module.

SUMMARY OF THE DISCLOSURE

In order to solve the above-mentioned problems, an object of the presentdisclosure is to provide an extinction ratio testing system for anoptical transceiver module.

In order to solve the above-mentioned problems, another object of thepresent disclosure is to provide an extinction ratio testing method forthe optical transceiver module.

In order to achieve the object of the present disclosure mentionedabove, the extinction ratio testing system of the present disclosure isapplied to the optical transceiver module. The extinction ratio testingsystem is characterized by including a microcontroller, an extinctionratio tester, and a thermostat. The microcontroller is electricallyconnected to the optical transceiver module. The extinction ratio testeris electrically connected to the optical transceiver module and themicrocontroller. The thermostat is electrically connected to themicrocontroller. Moreover, the extinction ratio testing system isconfigured to perform a high temperature extinction ratio testingprocedure. When the extinction ratio testing system performs the hightemperature extinction ratio testing procedure, the microcontroller isconfigured to control the thermostat to maintain the optical transceivermodule at a predetermined high temperature, and then the microcontrolleris configured to control the extinction ratio tester to test anextinction ratio of the optical transceiver module. Moreover, when theextinction ratio testing system performs the high temperature extinctionratio testing procedure and the extinction ratio of the opticaltransceiver module is lower than a standard extinction ratio, themicrocontroller is configured to control the optical transceiver moduleto increase a laser operating current of the optical transceiver moduleto increase the extinction ratio of the optical transceiver module.

Moreover, in an embodiment of the extinction ratio testing system of thepresent disclosure mentioned above, the extinction ratio testing systemfurther includes a counter electrically connected to themicrocontroller. Moreover, the counter is configured to record a currentincreasing number that the microcontroller controls the opticaltransceiver module to increase the laser operating current of theoptical transceiver module, wherein the current increasing number meansthe number of times the microcontroller controls the optical transceivermodule to increase the laser operating current of the opticaltransceiver module. Moreover, when the extinction ratio testing systemperforms the high temperature extinction ratio testing procedure and theextinction ratio of the optical transceiver module is lower than thestandard extinction ratio, if the current increasing number fails toreach three times (namely, the current increasing number does not reachthree times; namely, the current increasing number is zero time, onetime or two times), the microcontroller is configured to control theoptical transceiver module to increase the laser operating current ofthe optical transceiver module to increase the extinction ratio of theoptical transceiver module, and then the counter is configured toincrease the current increasing number by one.

Moreover, in an embodiment of the extinction ratio testing system of thepresent disclosure mentioned above, when the extinction ratio testingsystem performs the high temperature extinction ratio testing procedureand the extinction ratio of the optical transceiver module is lower thanthe standard extinction ratio, if the current increasing number reachesthree times, the extinction ratio testing system is configured to leavethe high temperature extinction ratio testing procedure, and themicrocontroller is configured to determine that the optical transceivermodule is fail (namely, the extinction ratio of the optical transceivermodule is lower than the standard extinction ratio).

Moreover, in an embodiment of the extinction ratio testing system of thepresent disclosure mentioned above, when the extinction ratio testingsystem performs the high temperature extinction ratio testing procedureand the extinction ratio of the optical transceiver module is equal toor higher than the standard extinction ratio, the extinction ratiotesting system is configured to leave the high temperature extinctionratio testing procedure, and the microcontroller is configured todetermine that the optical transceiver module is qualified (namely, theextinction ratio of the optical transceiver module is equal to or higherthan the standard extinction ratio).

Moreover, in an embodiment of the extinction ratio testing system of thepresent disclosure mentioned above, before the extinction ratio testingsystem performs the high temperature extinction ratio testing procedure,the extinction ratio testing system is configured to perform a normaltemperature extinction ratio testing procedure. When the extinctionratio testing system performs the normal temperature extinction ratiotesting procedure, the optical transceiver module is configured to betested for the extinction ratio of the optical transceiver module at apredetermined normal temperature lower than the predetermined hightemperature. Moreover, when the extinction ratio testing system performsthe normal temperature extinction ratio testing procedure and theextinction ratio of the optical transceiver module is lower than thestandard extinction ratio, the extinction ratio testing system isconfigured to leave the normal temperature extinction ratio testingprocedure, and the extinction ratio testing system is configured todetermine that the optical transceiver module is fail (namely, theextinction ratio of the optical transceiver module is lower than thestandard extinction ratio). Moreover, when the extinction ratio testingsystem performs the normal temperature extinction ratio testingprocedure and the extinction ratio of the optical transceiver module isequal to or higher than the standard extinction ratio, the extinctionratio testing system is configured to leave the normal temperatureextinction ratio testing procedure to enter the high temperatureextinction ratio testing procedure.

In order to achieve another object of the present disclosure mentionedabove, the extinction ratio testing method of the present disclosure ischaracterized by including following step. Perform a high temperatureextinction ratio testing procedure, wherein performing the hightemperature extinction ratio testing procedure including followingsteps. Maintain an optical transceiver module at a predetermined hightemperature. Test an extinction ratio of the optical transceiver module.Compare the extinction ratio of the optical transceiver module with astandard extinction ratio. Increase a laser operating current of theoptical transceiver module to increase the extinction ratio of theoptical transceiver module if the extinction ratio of the opticaltransceiver module is lower than the standard extinction ratio.

Moreover, in an embodiment of the extinction ratio testing method of thepresent disclosure mentioned above, performing the high temperatureextinction ratio testing procedure further includes following steps.Record a current increasing number that the laser operating current ofthe optical transceiver module is increased, wherein the currentincreasing number means the number of times the laser operating currentof the optical transceiver module is increased.

Increase the laser operating current of the optical transceiver moduleto increase the extinction ratio of the optical transceiver module andthen increase the current increasing number by one, if the extinctionratio of the optical transceiver module is lower than the standardextinction ratio and the current increasing number fails to reach threetimes (namely, the current increasing number does not reach three times;namely, the current increasing number is zero time, one time or twotimes).

Moreover, in an embodiment of the extinction ratio testing method of thepresent disclosure mentioned above, performing the high temperatureextinction ratio testing procedure further includes following step.Leave the high temperature extinction ratio testing procedure anddetermine that the optical transceiver module is fail (namely, theextinction ratio of the optical transceiver module is lower than thestandard extinction ratio), if the extinction ratio of the opticaltransceiver module is lower than the standard extinction ratio and thecurrent increasing number reaches three times.

Moreover, in an embodiment of the extinction ratio testing method of thepresent disclosure mentioned above, performing the high temperatureextinction ratio testing procedure further includes following step.Leave the high temperature extinction ratio testing procedure anddetermine that the optical transceiver module is qualified (namely, theextinction ratio of the optical transceiver module is equal to or higherthan the standard extinction ratio), if the extinction ratio of theoptical transceiver module is equal to or higher than the standardextinction ratio.

Moreover, in an embodiment of the extinction ratio testing method of thepresent disclosure mentioned above, the extinction ratio testing methodfurther includes following step. Perform a normal temperature extinctionratio testing procedure before performing the high temperatureextinction ratio testing procedure. Moreover, performing the normaltemperature extinction ratio testing procedure includes following steps.Maintain the optical transceiver module at a predetermined normaltemperature lower than the predetermined high temperature. Test theextinction ratio of the optical transceiver module. Compare theextinction ratio of the optical transceiver module with the standardextinction ratio. Leave the normal temperature extinction ratio testingprocedure and determine that the optical transceiver module is fail(namely, the extinction ratio of the optical transceiver module is lowerthan the standard extinction ratio), if the extinction ratio of theoptical transceiver module is lower than the standard extinction ratio.Leave the normal temperature extinction ratio testing procedure andenter the high temperature extinction ratio testing procedure, if theextinction ratio of the optical transceiver module is equal to or higherthan the standard extinction ratio.

The advantage of the present disclosure is to improve the pass rate ofthe extinction ratio test for the optical transceiver module.

Please refer to the detailed descriptions and figures of the presentdisclosure mentioned below for further understanding the technology,method and effect of the present disclosure achieving the predeterminedpurposes. It believes that the purposes, characteristic and features ofthe present disclosure can be understood deeply and specifically.However, the figures are only for references and descriptions, but thepresent disclosure is not limited by the figures.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 shows a block diagram of the extinction ratio testing system ofthe present disclosure applied to the optical transceiver module.

FIG. 2 shows a flow chart of the extinction ratio testing method of thepresent disclosure.

DETAILED DESCRIPTION OF THE DISCLOSURE

In the present disclosure, numerous specific details are provided, toprovide a thorough understanding of embodiments of the disclosure.Persons of ordinary skill in the art will recognize, however, that thepresent disclosure can be practiced without one or more of the specificdetails. In other instances, well-known details are not shown ordescribed to avoid obscuring aspects of the present disclosure. Nowplease refer to the figures for the explanation of the technical contentand the detailed description of the present disclosure:

FIG. 1 shows a block diagram of the extinction ratio testing system ofthe present disclosure applied to the optical transceiver module. Asshown in FIG. 1, an extinction ratio testing system 10 of the presentdisclosure is applied to an optical transceiver module 20. Theextinction ratio testing system 10 includes a microcontroller 102, anextinction ratio tester 104, a thermostat 106 and a thermostat 108. Theoptical transceiver module 20 includes a light-transmitting circuit 202,a laser diode 204, an optical fiber 206, a photodiode 208 and alight-receiving circuit 210. The components mentioned above areelectrically connected to each other.

In an embodiment, the extinction ratio testing system 10 of the presentdisclosure is configured to firstly perform a normal temperatureextinction ratio testing procedure for the optical transceiver module20; if the optical transceiver module 20 passes the normal temperatureextinction ratio testing procedure, then the extinction ratio testingsystem 10 of the present disclosure is configured to perform a hightemperature extinction ratio testing procedure for the opticaltransceiver module 20; the details are as follows.

When the extinction ratio testing system 10 performs the normaltemperature extinction ratio testing procedure for the opticaltransceiver module 20, the optical transceiver module 20 is arranged ina normal temperature testing chamber (not shown in FIG. 1), and themicrocontroller 102 and the extinction ratio tester 104 shown in FIG. 1are arranged in the normal temperature testing chamber, but neither thethermostat 106 nor the counter 108 is arranged in the normal temperaturetesting chamber.

Firstly, the extinction ratio testing system 10 performs the normaltemperature extinction ratio testing procedure. In the normaltemperature extinction ratio testing procedure, the optical transceivermodule 20 is at a predetermined normal temperature (for example, 25degrees Celsius), and the extinction ratio testing system 10 (namely,the microcontroller 102) is configured to control the extinction ratiotester 104 to test an extinction ratio of the optical transceiver module20. At this time, if the extinction ratio of the optical transceivermodule 20 is lower than a standard extinction ratio, the extinctionratio testing system 10 (namely, the microcontroller 102) is configuredto leave the normal temperature extinction ratio testing procedure, andthe extinction ratio testing system 10 (namely, the microcontroller 102)is configured to determine that the optical transceiver module 20 isfail (namely, the extinction ratio of the optical transceiver module 20is lower than the standard extinction ratio). But if the extinctionratio of the optical transceiver module 20 is equal to or higher thanthe standard extinction ratio, the extinction ratio testing system 10(namely, the microcontroller 102) is configured to leave the normaltemperature extinction ratio testing procedure to enter the hightemperature extinction ratio testing procedure. Moreover, the standardextinction ratio is, for example but not limited to, 9 dB.

When the extinction ratio testing system 10 performs the hightemperature extinction ratio testing procedure for the opticaltransceiver module 20, the optical transceiver module 20 is arranged ina high temperature testing chamber (not shown in FIG. 1), and themicrocontroller 102, the extinction ratio tester 104, the thermostat 106and the counter 108 shown in FIG. 1 are arranged in the high temperaturetesting chamber.

In the high temperature extinction ratio testing procedure, themicrocontroller 102 is configured to control the thermostat 106 tomaintain the optical transceiver module 20 at a predetermined hightemperature (for example, 70 degrees Celsius or 85 degrees Celsius)higher than the predetermined normal temperature, and then themicrocontroller 102 is configured to control the extinction ratio tester104 to test the extinction ratio of the optical transceiver module 20.

At this time, if the extinction ratio of the optical transceiver module20 is equal to or higher than the standard extinction ratio, theextinction ratio testing system 10 is configured to leave the hightemperature extinction ratio testing procedure, and the microcontroller102 is configured to determine that the optical transceiver module 20 isqualified (namely, the extinction ratio of the optical transceivermodule 20 is equal to or higher than the standard extinction ratio). Butif the extinction ratio of the optical transceiver module 20 is lowerthan the standard extinction ratio, the microcontroller 102 will firstlycheck whether a current increasing number reaches three times.

The current increasing number mentioned above means the number of timesthe microcontroller 102 controls the light-transmitting circuit 202 ofthe optical transceiver module 20 to increase a laser operating current212 of the optical transceiver module 20. The counter 108 is configuredto record the current increasing number. The light-transmitting circuit202 is configured to generate and transmit the laser operating current212 to the laser diode 204 to drive the laser diode 204 to work.

In addition, if the current increasing number fails to reach three times(namely, the current increasing number does not reach three times;namely, the current increasing number is zero time, one time or twotimes), the microcontroller 102 is configured to control thelight-transmitting circuit 202 of the optical transceiver module 20 toincrease the laser operating current 212 of the optical transceivermodule 20 to increase the extinction ratio of the optical transceivermodule 20, and then the counter 108 is configured to increase thecurrent increasing number by one, and the extinction ratio of theoptical transceiver module 20 is tested again to be compared with thestandard extinction ratio.

In addition, if the current increasing number reaches three times, theextinction ratio testing system 10 is configured to leave the hightemperature extinction ratio testing procedure, and the microcontroller102 is configured to determine that the optical transceiver module 20 isfail (namely, the extinction ratio of the optical transceiver module 20is lower than the standard extinction ratio).

Moreover, the current increasing number of the present disclosurementioned above is not limited to three times; for examples, the currentincreasing number is one time, two times, four times or five times andso on. The laser operating current 212 of the present disclosurementioned above is increased by 2 mA each time, but the presentdisclosure is not limited to this.

FIG. 2 shows a flow chart of the extinction ratio testing method of thepresent disclosure. As shown in FIG. 2, an extinction ratio testingmethod of the present disclosure mainly includes performing a normaltemperature extinction ratio testing procedure (step S100) andperforming a high temperature extinction ratio testing procedure (stepS200).

Performing the normal temperature extinction ratio testing procedure(step S100) mentioned above includes maintaining an optical transceivermodule at a predetermined normal temperature (step S102), testing anextinction ratio of the optical transceiver module (step S104), andcomparing the extinction ratio of the optical transceiver module with astandard extinction ratio (step S106).

In the step S106 mentioned above, if the extinction ratio of the opticaltransceiver module is lower than the standard extinction ratio, theextinction ratio testing method leaves the normal temperature extinctionratio testing procedure and determines that the optical transceivermodule is fail (step S300) (namely, the extinction ratio of the opticaltransceiver module is lower than the standard extinction ratio); if theextinction ratio of the optical transceiver module is equal to or higherthan the standard extinction ratio, the extinction ratio testing methodleaves the normal temperature extinction ratio testing procedure andenters the high temperature extinction ratio testing procedure (namely,the step S200 mentioned above).

Performing the high temperature extinction ratio testing procedure (stepS200) mentioned above includes maintaining the optical transceivermodule at a predetermined high temperature higher than the predeterminednormal temperature (step S202), testing the extinction ratio of theoptical transceiver module (step S204), and comparing the extinctionratio of the optical transceiver module with the standard extinctionratio (step S206).

In the step S206 mentioned above, if the extinction ratio of the opticaltransceiver module is equal to or higher than the standard extinctionratio, the extinction ratio testing method leaves the high temperatureextinction ratio testing procedure and determines that the opticaltransceiver module is qualified (step S400) (namely, the extinctionratio of the optical transceiver module is equal to or higher than thestandard extinction ratio).

In the step S206 mentioned above, if the extinction ratio of the opticaltransceiver module is lower than the standard extinction ratio, theextinction ratio testing method of the present disclosure enters a step208, to check whether a current increasing number reaches three times.Moreover, the current increasing number means the number of times alaser operating current of the optical transceiver module is increased.

In the step S208 mentioned above, if the current increasing number failsto reach three times (namely, the current increasing number does notreach three times; namely, the current increasing number is zero time,one time or two times), the extinction ratio testing method increasesthe laser operating current of the optical transceiver module toincrease the extinction ratio of the optical transceiver module (stepS210), and then the extinction ratio testing method increases thecurrent increasing number by one (step S212), and then the extinctionratio testing method of the present disclosure returns to the step S202.

In the step S208 mentioned above, if the current increasing numberreaches three times, the extinction ratio testing method leaves the hightemperature extinction ratio testing procedure and determines that theoptical transceiver module is fail (step S300) (namely, the extinctionratio of the optical transceiver module is lower than the standardextinction ratio).

Moreover, the predetermined normal temperature mentioned above is, forexample but not limited to, 25 degrees Celsius. The predetermined hightemperature mentioned above is, for example but not limited to, 70degrees Celsius or 85 degrees Celsius. The standard extinction ratiomentioned above is, for example but not limited to, 9 dB. The currentincreasing number mentioned above is not limited to three times; forexamples, the current increasing number is one time, two times, fourtimes or five times and so on. The laser operating current mentionedabove is increased by 2 mA each time, but the present disclosure is notlimited to this.

The advantage of the present disclosure is to improve the pass rate ofthe extinction ratio test for the optical transceiver module.

Although the present disclosure has been described with reference to thepreferred embodiment thereof, it will be understood that the disclosureis not limited to the details thereof. Various substitutions andmodifications have been suggested in the foregoing description, andothers will occur to those of ordinary skill in the art. Therefore, allsuch substitutions and modifications are intended to be embraced withinthe scope of the disclosure as defined in the appended claims.

What is claimed is:
 1. An extinction ratio testing system (10) appliedto an optical transceiver module (20), the extinction ratio testingsystem (10) characterized by comprising: a microcontroller (102)electrically connected to the optical transceiver module (20); anextinction ratio tester (104) electrically connected to the opticaltransceiver module (20) and the microcontroller (102); a thermostat(106) electrically connected to the microcontroller (102); and a counter(108) electrically connected to the microcontroller (102), wherein theextinction ratio testing system (10) is configured to perform a hightemperature extinction ratio testing procedure; when the extinctionratio testing system (10) performs the high temperature extinction ratiotesting procedure, the microcontroller (102) is configured to controlthe thermostat (106) to maintain the optical transceiver module (20) ata predetermined high temperature, and then the microcontroller (102) isconfigured to control the extinction ratio tester (104) to test anextinction ratio of the optical transceiver module (20); wherein whenthe extinction ratio testing system (10) performs the high temperatureextinction ratio testing procedure and the extinction ratio of theoptical transceiver module (20) is lower than a standard extinctionratio, the microcontroller (102) is configured to control the opticaltransceiver module (20) to increase a laser operating current (212) ofthe optical transceiver module (20) to increase the extinction ratio ofthe optical transceiver module (20); wherein the counter (108) isconfigured to record a current increasing number that themicrocontroller (102) controls the optical transceiver module (20) toincrease the laser operating current (212) of the optical transceivermodule (20); wherein when the extinction ratio testing system (10)performs the high temperature extinction ratio testing procedure and theextinction ratio of the optical transceiver module (20) is lower thanthe standard extinction ratio, if the current increasing number fails toreach three times, the microcontroller (102) is configured to controlthe optical transceiver module (20) to increase the laser operatingcurrent (212) of the optical transceiver module (20) to increase theextinction ratio of the optical transceiver module (20), and then thecounter (108) is configured to increase the current increasing number byone.
 2. The extinction ratio testing system (10) of claim 1, whereinwhen the extinction ratio testing system (10) performs the hightemperature extinction ratio testing procedure and the extinction ratioof the optical transceiver module (20) is lower than the standardextinction ratio, if the current increasing number reaches three times,the extinction ratio testing system (10) is configured to leave the hightemperature extinction ratio testing procedure, and the microcontroller(102) is configured to determine that the extinction ratio of theoptical transceiver module (20) is lower than the standard extinctionratio.
 3. The extinction ratio testing system (10) of claim 2, whereinwhen the extinction ratio testing system (10) performs the hightemperature extinction ratio testing procedure and the extinction ratioof the optical transceiver module (20) is equal to or higher than thestandard extinction ratio, the extinction ratio testing system (10) isconfigured to leave the high temperature extinction ratio testingprocedure, and the microcontroller (102) is configured to determine thatthe extinction ratio of the optical transceiver module (20) is equal toor higher than the standard extinction ratio.
 4. The extinction ratiotesting system (10) of claim 3, wherein before the extinction ratiotesting system (10) performs the high temperature extinction ratiotesting procedure, the extinction ratio testing system (10) isconfigured to perform a normal temperature extinction ratio testingprocedure; when the extinction ratio testing system (10) performs thenormal temperature extinction ratio testing procedure, the opticaltransceiver module (20) is configured to be tested for the extinctionratio of the optical transceiver module (20) at a predetermined normaltemperature lower than the predetermined high temperature; wherein whenthe extinction ratio testing system (10) performs the normal temperatureextinction ratio testing procedure and the extinction ratio of theoptical transceiver module (20) is lower than the standard extinctionratio, the extinction ratio testing system (10) is configured to leavethe normal temperature extinction ratio testing procedure, and theextinction ratio testing system (10) is configured to determine that theextinction ratio of the optical transceiver module (20) is lower thanthe standard extinction ratio; wherein when the extinction ratio testingsystem (10) performs the normal temperature extinction ratio testingprocedure and the extinction ratio of the optical transceiver module(20) is equal to or higher than the standard extinction ratio, theextinction ratio testing system (10) is configured to leave the normaltemperature extinction ratio testing procedure to enter the hightemperature extinction ratio testing procedure.
 5. An extinction ratiotesting method characterized by comprising: performing a hightemperature extinction ratio testing procedure (S200), whereinperforming the high temperature extinction ratio testing procedure(S200) comprises: maintaining an optical transceiver module at apredetermined high temperature (S202); testing an extinction ratio ofthe optical transceiver module (S204); comparing the extinction ratio ofthe optical transceiver module with a standard extinction ratio (S206);increasing a laser operating current of the optical transceiver moduleto increase the extinction ratio of the optical transceiver module ifthe extinction ratio of the optical transceiver module is lower than thestandard extinction ratio (S210), recording a current increasing numberthat the laser operating current of the optical transceiver module isincreased (S208); and increasing the laser operating current of theoptical transceiver module to increase the extinction ratio of theoptical transceiver module (S210) and then increasing the currentincreasing number by one (S212), if the extinction ratio of the opticaltransceiver module is lower than the standard extinction ratio and thecurrent increasing number fails to reach three times.
 6. The extinctionratio testing method of claim 5, wherein performing the high temperatureextinction ratio testing procedure (S200) further comprises: leaving thehigh temperature extinction ratio testing procedure and determining thatthe extinction ratio of the optical transceiver module is lower than thestandard extinction ratio, if the extinction ratio of the opticaltransceiver module is lower than the standard extinction ratio and thecurrent increasing number reaches three times (S300).
 7. The extinctionratio testing method of claim 6, wherein performing the high temperatureextinction ratio testing procedure (S200) further comprises: leaving thehigh temperature extinction ratio testing procedure and determining thatthe extinction ratio of the optical transceiver module is equal to orhigher than the standard extinction ratio, if the extinction ratio ofthe optical transceiver module is equal to or higher than the standardextinction ratio (S400).
 8. The extinction ratio testing method of claim7, further comprising: performing a normal temperature extinction ratiotesting procedure (S100) before performing the high temperatureextinction ratio testing procedure (S200), wherein performing the normaltemperature extinction ratio testing procedure (S100) comprises:maintaining the optical transceiver module at a predetermined normaltemperature lower than the predetermined high temperature (S102);testing the extinction ratio of the optical transceiver module (S104);comparing the extinction ratio of the optical transceiver module withthe standard extinction ratio (S106); leaving the normal temperatureextinction ratio testing procedure and determining that the extinctionratio of the optical transceiver module is lower than the standardextinction ratio, if the extinction ratio of the optical transceivermodule is lower than the standard extinction ratio (S300); and leavingthe normal temperature extinction ratio testing procedure and enteringthe high temperature extinction ratio testing procedure, if theextinction ratio of the optical transceiver module is equal to or higherthan the standard extinction ratio (S200).